Reviews of topical problems

High borides: determining the features and details of lattice dynamics from neutron spectroscopy

 a, b
a National Research Nuclear University MEPhI, Kashirskoe shosse 31, Moscow, 115409, Russian Federation
b National Research Centre Kurchatov Institute, pl. akad. Kurchatova 1, Moscow, 123182, Russian Federation

This paper reviews wide-ranging research that combined inelastic neutron scattering spectroscopy with phenomenological and \textit{ab initio} calculations to study the lattice dynamics and specifics of the electron--phonon interaction in three-dimensional boron cluster-network systems MB6 MB12 (M = La, Sm, Yb, Lu, Zr). Close similarity is found between the atomic vibration spectra of these systems, which is fundamentally due to these systems' strong hierarchy of interatomic interaction and which manifests itself both in the shape of the low-energy phonon dispersion and in the position of the high-energy edge of the spectrum. Manifestations of the strong electron--phonon interactions in the lattice vibration spectra of the borides are studied in detail and their relation to the nature and features of the valence-unstable state of rare-earth ions is examined. Resonance nonadiabaticity and magnetovibration interaction effects in spin- and valence-fluctuating systems are given special attention.

Fulltext is available at IOP
Keywords: neutron spectroscopy, phonon spectra, electron-phonon interaction, rare earth borides
PACS: 61.05.F−, 61.66.Dk, 63.20.−e (all)
DOI: 10.3367/UFNe.0185.201504b.0353
Citation: Alekseev P A "High borides: determining the features and details of lattice dynamics from neutron spectroscopy" Phys. Usp. 58 330–344 (2015)
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Received: 16th, July 2014, revised: 24th, September 2014, 7th, October 2014

:    « : » 185 353–370 (2015); DOI: 10.3367/UFNr.0185.201504b.0353

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